The weather shouldn't be to bad most likely during the day you Will need a light sweater and at night I'd bring a jacket. Keep in mind you will be walking and going inside so make sure its a jacket that won't get you over heated once your standing on the inside portion of the queue for lets say something like Indy. The rain In Co Cal never really gets to unmanageable especially for someone who lives in the bay area If it does rain I see it as a good thing because for some reason locals tend to get undercover even when its sprinkling so wait times tend to decrease a bit. If it should rain ponchos with mickey on them are available for purchase. The weather has been real hit or miss latley weve had a couple of days that reached the high 80's in the past few weeks so I would suggest checking the weather right before your trip. I would suggest cheking this link.
http://abclocal.go.com/kabc/index?se...her&id=4122444
you want the L.A. metro/Orange County.